157
Fig. 38 — CCN System Architecture
SERVICE
Service Access
All unit components can be reached through clearly labeled
hinged access doors. These doors are not equipped with tiebacks,
so if heavy duty servicing is needed, either remove them or prop
them open to prevent accidental closure.
Each door is held closed with 3 latches. The latches are secured to
the unit with a single 1/4 in. –20 x 1/2 in. long bolt. See Fig. 39.
To open, loosen the latch bolt using a 7/16 in. wrench. Pivot the
latch so it is not in contact with the door. Open the door. To shut,
reverse the above procedure.
NOTE: Disassembly of the top cover may be required under spe-
cial service circumstances. It is very important that the orientation
and position of the top cover be marked on the unit prior to disas-
sembly. This will allow proper replacement of the top cover onto
the unit and prevent rainwater from leaking into the unit.
Fig. 39 — Door Latch
NETWORK
OPTIONS
REMOTE
CCN SITE
AUTODIAL
GATEWAY
NON CARRIER
HVAC
EQUIPMENT
TERMINAL
SYSTEM
MANAGER
TCU
ROOFTOP
UNIT
DAV AIR
TERMINAL
TCU
TCU
DAV AIR
TERMINAL
AIR DISTRIBUTION-DIGITAL AIR VOLUME CONTROL (DAV)
DAV FAN
POWERED
MIXING
BOX
TO
ADDITIONAL
TERMINALS
HEATING/COOLING UNITS
BUILDING SUPERVISOR
ROOFTOP
UNIT
CL
ROOFTOP
UNIT
CL
ROOFTOP
UNIT
CL
ROOFTOP
UNIT
CL
CCN BUS
CL
COMFORT
CONTROLLER
LEGEND
CCN — Carrier Comfort Network®
CL — ComfortLink Controls
DAV — Digital Air Volume
HVAC — Heating, Ventilation, and Air Conditioning
TCU — Terminal Control Unit
IMPORTANT: After servicing is completed, make sure door is
closed and relatched properly, and that the latches are tight. Fail-
ure to do this can result in water leakage into the indoor-air sec-
tion of the unit.
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